Genus of North American plants cultivated for their white, red, purple or pink flowers (7)
I believe the answer is:
clarkia
(Other definitions for clarkia that I've seen before include "Lack air (anag) - garden flower" , "Showy garden plant; lack air (anagram)" , "White, pink or purple-flowered plant" .)
I've seen this clue in The Mirror.
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